Rail services on track for heat-related reductions

Rail services were scaled back during the heatwave a fortnight ago and Lino Di Lernia from the Transport Department says that could happen again.

"If we have two or more days in a row that have extreme heat, we will be implementing our heat policy which is essentially reducing the frequency in the peak period and doubling the size of our trains," he said.

"There's a good chance we will be initiating that tomorrow."

Peak-hour trains were delayed by half an hour on the Noarlunga line when a rock lodged in a switch.

The line has only recently re-opened after an almost year-long refurbishment.